Catalytic effect of alkalrbothei chlorides on carmic reduction of pre-oxidized ilmenite

来源期刊：中国有色金属学报(英文版)2000年第6期

论文作者：吴剑辉 孙康 马跃宇 刘明月 张永健

文章页码：813 - 816

Key words：thermogravimetry; non-isothermally carbothermic reduction; alkali additives; pre-oxidized ilmenite

Abstract: A computer-monitoring thermogravimetric system was used to study the effect of alkali chlorides(MCl, M=Li, Na, K and Cs) on the carbothermic reduction of pre-oxidized ilmenite in the course of a linear rise in temperature from 600℃to 1 000℃. The experimental results indicate that all the alkali chlorides can speed up the reduction process of preoxidized ilmenite, moreover, KCl is the most effective catalyst of the chlorides, while the catalytic effects of LiCl and CsCl are relatively weaker. It seems that the catalytic mechanism of LiCl is different from those of the other alkali chlorides. The cross-sectional morphology of the partially reduced pre-oxidized ilmenite particles and the distribution of potassiumions within them were examined by means of scanning electronic microscopy and electronic probe microanalysis, respectively, which shows that the reduction proceeds topochemically and the alkali ion enriches at the periphery of the particles.